Superheater for steam-boilers.



G. GAILLE.

SUPERHEATER FOR STEAM BOILERS.

APPLICATION FILED I'EB.15, 1912.

2 SHEETS-SHEET l.

WITNESSES;

COLUMBIA PLANOGRAPH CO.,WASHINGTQN, u. c.

Patented Apr. 1, 1913.

G. GAILLE.

SUPERHEATER FOR STEAM BOILERS.

APPLICATION FILED PEB.15, 1912.

1,057,705. Patented Apr. 1, 1913.

2 SHBBTS-SHEET 2.

Fly. 2.

WIT/V 56655:

J I I INVF/VITOR; Z y @a/o lq, 44 f.

COLUMBIA PLANOGRAPH CO.. WASHINGTON. n. c

UNITED sra rns i a rnnr OFFICE. 1

CHARLES CAILLE, OF LEPERREUX, FRANCE.

SUPERHEATER FOR STEAM-BOILERS.

To all whom if may concern Be it known that I, CHARLES CAILLE, citi zenof the Republic of France, residing at 24 Rue de la Gaite, Leperreux,Seine, France, have invented new and useful Improvements in Superheatersfor Steam- Boilers, of which the following is a specification.

This invention relates to a device for facilitating, with locomotive andother tubular boilers, the raising of the temperature of motive-powersteam, exhaust steam or feed-water.

This apparatus is applicable more particularly to re-heating orsuperheating contrivances placed in the smoke boxes of tubular boilers.

Devices are known by which a part of the flames or the hot gases of thefire-box is directed to the smoke box for the reheating of thesuperheater.

In the known devices, the tubes, conducting this part of the heatinggas, are formed either by a number of tubes of the boiler tube nest orby tubes set into the tubes of the nest, the latter being absolutelyisolated and notsubjected to the direct influence of the hot gases.

According to the present invention, the tubes, conducting the hot gasesto the superheater, are inserted concentrically in the smoke tubes ofthe boiler and extend on one end in the fire box and on the other end ina pipe connected to the reheating apparatus (superheater of the workingsteam or the exhaust steam, or reheater of the feed water). But theyallow free entrance or exit of the gases in the annular space betweentheir exterior surface and the interior surface of the smoke tubes, insuch manner that a part of the gases passes in the smoke tube, reducedin its annular section, and another part is diverted toward thesuperheater by the central tube. The total section is only reduced bythe thickness of the central tube and the hot gases still act upon thesmoke tubes proper of the boiler. In fact, there is utilized a centralcurrent of the hot gases, the heat of which would otherwise be lost, andit is utilized without reducing the effect of the peripheral currentupon the walls of the smoke tube.

Figures 1 and 2 of the annexed drawing show, as representative examples,the in- Specification of Letters Patent.

Application filed February 15, 1912.

Patented Apr. 1, 1913.

Serial No. 677,755.

vention applied respectively to a superheater for motive-power steam anda re heater for exhaust steam. Fig. 3 is a cross section on a largerscale taken along AA. of Fig. 2.

In Figs. 1 and 2, represents the firetubes of a locomotive boiler ofwhich 6 is the fire box and c the smoke box. In Fig. 1, (Z is the casingof a motive-power steam superheater. This superheater, located in thesmoke box, is, in a known manner, composed of a plurality of tubes 6connected at their upper ends to an inlet collector f, and at theirlower ends to an outlet collector" 9 connected to the cylinders of theengine. Into the casing d debouch one or more pipes h, to which areconnected by suitable junction-elements 2', tubes 7', which conduct hotgases. These tubes 7' are supported concentrically within the fire tubesa and are held in place near their ends by feathers j (Fig. 3) formedthereon. The ends of the tubes j, which open into the fire-box, arepreferably, extended and widened out, as shown at 7' Figs. 1 and 2;these trumpet shaped extensions may in practice be covered withrefractory material, cement or other substance non-conductive of heat.This covering may extend over a certain length toward the smoke-box ofthe portions of the tubes 3' situated in the interior of the fire-tubes.

As shown in dot-dash lines in Fig. 1, the mouths of the tubes may bebent upward toward the crown of the furnace in order to keep the saidtubes as far as possible free from particles of unburnt coal. A wellknown collector for preventing the entry of such particles may besupported between the tubes j and the pipes 2'.

The flame and the hot gases taken from the fire-box circulatesimultaneously in the tubes j and in the annular space formed betweenthe latter and the fire-tubes a. The gases diverted to the tubes y'reach the reheating contrivance cl by means of the junction elements 2'and the pipes h.

The evacuation of the gases after their circulation which is directed bymeans of partial partitions takes place through a pipe 4%. In thelatter, a valve 11- can be fitted adapted to be actuated from outside bymeans of any suitable connection.

In Fig. 2 the invention is shown applied to a reheater for exhaust steamhaving for its object the avoidance of the spraying of condensed steam:(5 represents the casing of the plurality of tubes 0 in which theexhaust steam admitted at 0 and exhausted at p circulates. The gases andflame taken from the fire-box are, as in the preceding example conductedby tubes 7' supported concentrically to the fire tubes at and evacuatedthrough the pipe m.

It is evident that water could be circulated through a group of tubes 6,arranged as in Figs. 1 and 2 and suitably connected to a source of feedwater, and subsequently delivered to the boiler.

The tubes j which conduct the diverted hot gases, instead of reaching asfar as the fire-box, may have their ends within the tubes a, as shown atr in Fig. 1 in the case of one of these tubes.

I claim:

1. In apparatus of the class described, in combination, a fire box, asmoke box, fire tubes extending between and communicating with saidboxes, a heater within said smoke box and comprising a casing and a tubecommunicating with said casing and extending within one of said firetubes, said second mentioned tube being open at both of its ends wherebyhot gases from the fire box will pass through said second mentioned tubeand into said casing.

2. In apparatus of the class described, in combination, a fire box, asmoke box, fire tubes extending between and communicating with saidboxes, a heater within said smoke box and comprising a casing and a tubecommunicating with said casing and extending within one of said firetubes, said second mentioned tube being open at both of its ends wherebyhot gases from the fire box will pass through said second mentioned tubeand into said casing, said sec- 0nd mentioned tube being of smallerdiameter than the fire tube into which it extends.

3. In apparatus of the class described, in combination, a fire box, asmoke box, fire tubes extending between and communicating with saidboxes, a heater within said smoke box and comprising a casing and a tubecommunicating with said casing and extending within one of said firetubes, said second mentioned tube being open at both of its ends wherebyhot gases from the fire box will pass through said second mentioned tubeand into said casing, said second mentioned tube being spaced from theinner wall of the fire tube into which it extends, whereby hot gasesfrom the fire box Will pass therefrom to the smoke box through the spacebetween the tubes.

at. In apparatus of the class described, in combination, a fire box, asmoke box, fire tubes extending between and communicating with saidboxes, a heater within said smoke box and comprising a casing and a tubecommunicating with said casing and extending within one of said firetubes, said second mentioned tube being open at both of its ends wherebyhot gases from the fire box will pass through said second mentioned tubeand into said casing, said second mentioned tube being positionedconcentrically with respect to the fire tube into which it extends,whereby hot gases from the fire box will pass therefrom to the smoke boxthrough the annular space between the tubes.

In testimony whereof I have signed my name to this'specification. in thepresence of two subscribing witnesses.

CHARLES GAILLE.

Witnesses:

LOUIS FAUTRAT, H. C. Coxn.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

Washington, D. G.

